To make it more viable in PvE and keep it balanced in PvP, it should explode on kills, killing adds all around. It should also deal more damage per bullet, not more damage than precision golden gun, but something that makes it worth using. It's the most aesthetic subclass but it's near useless in PvE.
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I remember when Golden Gun made Guardians explode at the start of D1. Hilarious popping a shot on a guardian capping a zone and getting a triple down! I'd argue Bottom Tree should get that on precision kills. But I miiiiight be biased lol